启用远程根访问可能是危险的。如果您要设置具有更严格权限的用户帐户，则更可取。以下三个步骤可以做到这一点。

Ensure that the line starting with bind-address ... is at least commented out in your my.ini or my.cnf file. If it doesn't exist, move on. You can find this file in C:\ProgramData\MySQL\MySQL Server 8.0 on Windows. Afterwards, check that the user account you are establishing the connection with does not have localhost in the Limit to Hosts Matching field. While it isn't recommended, you can instead put % in that field for testing purposes. You can do this by opening a local connection to the server with MySQL Workbench, then going to Server>Users and Privileges from the menu bar and finding the user account you want to connect with.

“限制主机匹配”字段是不允许您连接非本地。也就是说，它将接受的连接限制为一个IP地址模式。理想情况下，您应该从静态IP地址或子网访问MySQL服务器，这样您就可以尽可能地限制。

显然，您的防火墙应该允许MySQL服务器应用程序通过您想要的端口进行通信。您和服务器之间的物理网络设备应该允许在您想要连接的端口上进行通信。(通常端口为3306)

这篇如何在局域网上安装MySQL服务器的博客将有助于从头开始安装MySQL

对于OS X用户，请注意bind-address参数通常是在launchd plist中设置的，而不是在my.ini文件中。所以在我的情况下，我删除了<string>——bind-address=127.0.0.1</string>从/Library/LaunchDaemons/homebrew.mx .mariadb.plist。

启用远程根访问可能是危险的。如果您要设置具有更严格权限的用户帐户，则更可取。以下三个步骤可以做到这一点。

Ensure that the line starting with bind-address ... is at least commented out in your my.ini or my.cnf file. If it doesn't exist, move on. You can find this file in C:\ProgramData\MySQL\MySQL Server 8.0 on Windows. Afterwards, check that the user account you are establishing the connection with does not have localhost in the Limit to Hosts Matching field. While it isn't recommended, you can instead put % in that field for testing purposes. You can do this by opening a local connection to the server with MySQL Workbench, then going to Server>Users and Privileges from the menu bar and finding the user account you want to connect with.

“限制主机匹配”字段是不允许您连接非本地。也就是说，它将接受的连接限制为一个IP地址模式。理想情况下，您应该从静态IP地址或子网访问MySQL服务器，这样您就可以尽可能地限制。

显然，您的防火墙应该允许MySQL服务器应用程序通过您想要的端口进行通信。您和服务器之间的物理网络设备应该允许在您想要连接的端口上进行通信。(通常端口为3306)

只是F.Y.I 我为这个问题苦恼了好几个小时。最后，我打电话给我的主机提供商，发现在我使用云服务器的情况下，在1and1的控制面板中，他们有一个二级防火墙，你必须克隆并添加端口3306。一加进去我就直接进去了。

检查远程服务器是否允许通配符访问端口3306:

sudo lsof -i -P -n | grep监听

不应该是这样的:

mysqld 23083 mysql 21u IPv4 145900142 0t0 TCP 127.0.0.1:3306(听)

在这种情况下，我们需要更新/etc/mysql/mysql.conf.d/mysqld.cnf或/etc/mysql/mariadb.conf.d/50-server.cnf:

Bind-address = 127.0.0.1——> 0.0.0.0

然后重新启动mysql "sudo service mysql restart"

为了从客户端测试mySQL连接:

Nc -vz <host_address> 3306